M16CSLASH1N datasheet(34/238 Pages) RENESAS

34 / 238 page

Rev.1.00

Oct 20, 2004

page 22 of 222

M16C/1N Group

5. Reset

REJ09B0007-0100Z

5.2 Software Reset

Writing "1" to bit 3 of the processor mode register 0 (address 000416) applies a (software) reset to the

microcomputer. Set the PM03 bit to "1" after selecting on-chip oscillator for CPU's operating clock source.

A software reset has almost the same effect as a hardware reset. The contents of internal RAM are

preserved.

Figure 5.4 shows the processor mode register 0 and 1.

Figure 5.4 Processor mode register 0 and 1

b5 b4

Nothing is assigned.

In an attempt to write to this bit, write "0". The value, if read, turns out to be

indeterminate.

Nothing is assigned.

In an attempt to write to these bits, write "0". The value, if read, turns out to be

indeterminate.

The device is reset when this bit

is set to "1". The value of this bit

is "0" when read.

Note 1: Set bit 1 of the protect register (address 000A16) to "1" when writing new values to this register.

b5 b4

PM12

WDT interrupt/reset

switching bit

DATAROM area access

bit (Note 2)

Nothing is assigned.

In an attempt to write to this bit, write "0". The value, if read, turns out to be

indeterminate.

Nothing is assigned.

In an attempt to write to these bits, write "0". The value, if read, turns out to be

indeterminate.

0 : Watchdog timer interrupt

1 : Reset (Note 3)

Processor mode register 1 (Note 1)

Note 1: Set bit 1 of the protect register (address 000A16) to "1" when writing new values to this register.

Note 2: This bit is valid for the flash memory version. For the mask ROM version, this bit must be set to "0".

Note 3: After setting this bit to "1", can not change to "0" by software.

PM17

Wait bit

0 : No wait

1 : Wait

0 : Disabled

1 : Enabled

Processor mode register 0 (Note 1)

Reserved bit

PM03

Software reset bit

Set to "0"

PM10

Reserved bit

Set to "0"

Symbol

PM0

Address

000416

When reset

XXXX0X002

Symbol

PM1

Address

000516

When reset

00XXX0X02

Function

Bit name

Bit symbol

Function

Bit name

Bit symbol

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